Forum > GPU crunching
Driver, application and VRAM requirement?
Miep:
--- Quote from: Richard Haselgrove on 26 Jul 2010, 05:22:40 pm ---Not the memory requirements, no - I think most of the testers who have chimed in are running 512MB or higher.
There are special problems with running the 3.0 or 3.1 DLLs with the older v6.08, v6.09 or V12 applications, because of the 'strong versioning' introduced with 3.0, as Jason mentioned. The apps expect DLLs called 'cudart.dll' and 'cufft.dll', but the fft.dll has to have access to 'cudart32_30_14.dll' or 'cudart32_31_9.dll'. You end up having to have three CUDA DLLs, not two, with the 'rt' file copied and renamed (and listed under both names in both sections of app_info.xml.
--- End quote ---
Sorry, you lost me on that one. I was going to take the 'easy' approach and rename the files to cut off the version number instead of editing app_info.
For the record 2.3 dll runs and goes to 250MB as well - isn't that one supossed to use more RAM? Going to give it the full over night run and deal with the next generation tomorrow.
Richard Haselgrove:
That's the point. The "easy" approach fails after 2.3 - we found that out the hard way when 3.0 came out. I can talk you through it, but too late for both of us tonight.
I don't think anyone really "knows" that 2.3 requires more VRAM than 2.2, 2.1 or 2.0: it's been asserted, but without evidence. If they run overnight, that'll be good news.
Miep:
--- Quote from: Richard Haselgrove on 26 Jul 2010, 05:54:18 pm ---That's the point. The "easy" approach fails after 2.3 - we found that out the hard way when 3.0 came out. I can talk you through it, but too late for both of us tonight.
I don't think anyone really "knows" that 2.3 requires more VRAM than 2.2, 2.1 or 2.0: it's been asserted, but without evidence. If they run overnight, that'll be good news.
--- End quote ---
Well, can only report what I see on my system - and since the 2.2/2.3 only work since the newest driver (258.96) wouldn't know if memory uptake on older drivers is different. They certainly all require less memory to run than before. (well the 2.0/2.2 do)
Miep:
That ran like a treat. And the increase in speed with the higher dlls is remarkable.
Of the 3 tasks that ran O/N 1 has validated and 2 are waiting for wingman. (for reference: valid pending pending)
Is there anything in stderr to check which dlls were used?
Raistmer:
--- Quote from: Miep on 27 Jul 2010, 01:33:08 am ---
Is there anything in stderr to check which dlls were used?
--- End quote ---
I'm afraid not.
Since 2.3 there was not such big speed improvement so probably with 2.3 DLLs you reached peak GPU performance until V13/CUDA 3.1 app will be introduced to public.
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